{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2016-2NB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2016-2NB0","canonicalUrl":"https://aoctrl.com/siemens/3RB2016-2NB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2016-2NB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB2016-2NB0, CLASS 20E, 3-pole, ATEX Ex II (2) GD, screw terminals, contactor mounting, 45 mm width.","salesMarkdown":"The Siemens 3RB2016-2NB0 is a SIRIUS solid-state overload relay — a CLASS 20E trip curve device for three-phase motor protection in control panels. It mounts directly onto a contactor (contactor mounting per), saving DIN-rail space and keeping the motor branch circuit compact. The CLASS 20E trip class allows a 20-second thermal overload before tripping. ## ATEX and hazardous-area deployment This relay carries ATEX approval PTB 06 ATEX 3001 Ex II (2) GD. ## Termination and wiring constraints Main current circuit terminals are screw-type, accepting 0.5 to 4 mm² solid (2× 0.5 to 2.5 mm²) or 2× AWG 18 to 14. Auxiliary and control circuit terminals also screw-type, accepting 2× AWG 20 to 14. The solid wire range covers standard panel-building practice — no need for ferrule conversion on solid runs. Finely stranded with core-end processing accepts 0.5 to 2.5 mm² (2× 0.5 to 1.5 mm²). Strip length and torque spec follow the SIRIUS wiring guidelines; verify free-wheel diode polarity on the contactor coil if sharing suppression. Relative humidity tolerance is 100 % — suitable for condensing environments inside non-heated enclosures. Shock resistance is 15 g for 11 ms, which covers most industrial vibration profiles from conveyor drives and pump skids. ## EMC immunity and surge withstand Surge voltage resistance rated at 6 kV. Burst immunity per IEC 61000-4-4 is 2 kV on power ports, 1 kV on signal ports — severity degree 3. That covers most industrial installations without external surge suppression, though a Type 2 SPD on the panel feeder is still recommended for outdoor or long-cable runs.","metaTitle":"Siemens 3RB2016-2NB0 SIRIUS solid-state overload relay, CLAS","metaDescription":"Siemens SIRIUS 3RB2016-2NB0 solid-state overload relay, CLASS 20E, ATEX Ex II (2) GD, 3 poles, contactor mounting, 45mm wide, current production. Source to RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Overload Relays"],"specifications":{"Depth":"73 mm","Solid":"0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)","Width":"45 mm","Height":"64 mm","Upwards":"0 mm","at 24 V":"2 A","at 60 V":"0.55 A","Forwards":"0 mm","Per Pole":"0.02 W","at 110 V":"0.3 A","at 120 V":"4 A","at 125 V":"0.3 A","at 220 V":"0.11 A","at 230 V":"3 A","Backwards":"0 mm","Downwards":"0 mm","Trip Class":"CLASS 20E","At The Side":"6 mm","During Storage":"-40 ... +80 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Fastening Method":"Contactor mounting","Shock Resistance":"15g / 11 ms","Mounting Position":"any","Product Brand Name":"SIRIUS","Type Of Protection":"PTB 06 ATEX 3001 Ex II (2) GD","Product Designation":"solid-state overload relay","For Main Current Circuit":"screw-type terminals","Substance Prohibitance (Date)":"01.07.2006 00:00:00","at AWG cables for main contacts":"2x (18 ... 14)","For Auxiliary And Control Circuit":"screw-type terminals","Relative Humidity During Operation":"100 %","due to burst acc. to IEC 61000-4-4":"2 kV (power ports), 1 kV (signal ports) corresponds to degree of severity 3","reference code acc. to IEC 81346-2":"F","Surge Voltage Resistance Rated Value":"6 kV","at AWG cables for auxiliary contacts":"2x (20 ... 14)","Finely Stranded With Core End Processing":"0.5 ... 2.5 mm², 2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","electrostatic discharge acc. to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","operating voltage at AC-3 rated value maximum":"690 V","field-based interference acc. to IEC 61000-4-3":"10 V/m","Size Of Contactor Can Be Combined Company-Specific":"S00","due to conductor-earth surge acc. to IEC 61000-4-5":"2 kV (line to earth) corresponds to degree of severity 3","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 6 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes","power loss [W] for rated value of the current at AC in hot operating state":"0.05 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"0.32 ... 1.25 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=195346&mlfb=3RB2016-2NB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RB2016-2NB0/alternatives.json"},"ai":{"faq":[{"question":"What is the physical width and depth of the 3RB2016-2NB0?","answer":"Width is 45 mm, depth is 73 mm, height is 64 mm. It mounts directly on a contactor, requiring 0 mm clearance upward, forward, backward, and downward, and 6 mm at the side."},{"question":"What wire sizes does the 3RB2016-2NB0 accept?","answer":"Main circuit screw terminals accept 0.5 to 4 mm² solid (2× 0.5 to 2.5 mm²) or 2× AWG 18 to 14. Auxiliary terminals accept 2× AWG 20 to 14. Finely stranded with ferrule: 0.5 to 2.5 mm² (2× 0.5 to 1.5 mm²)."},{"question":"How does the 3RB2016-2NB0 compare to the 6ES7222-1BF22-0XA0?","answer":"They are not substitutes. The 3RB2016-2NB0 is a SIRIUS solid-state overload relay for three-phase motor protection. The 6ES7222-1BF22-0XA0 is a Siemens SIMATIC S7-200 digital output module for PLC systems. They serve entirely different functions — motor branch circuit protection versus PLC I/O — and cannot be swapped without a complete panel redesign."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2016-2NB0","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RB2016-2NB0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}